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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 10-31-2019, 11:13 PM
mohamedrani mohamedrani is offline
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spark plug wrench

hey guys,

i tried to change the spark plugs in my car, the size was written that it's a 16 mm wrench , when i bought one , found that i've 21 mm socket "should have checked the new spark plugs' size before buying the wrench ,

anyway i bout another one which is 21 mm and it fits the size with the new spark plugs , but the strange thing is the wrench doesn't go all the way to the spark plugs in the car,as if the wall gets little tighter when getting close to the spark plugs, it that normal and need to buy another wrench or there's something wrong , because i can't believe that i can't change my spark plugs and I WILL NOT go to a mechanic just to change them


these two which i bought, and the one that's alone is i found on the internet , would it help ?
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Last edited by mohamedrani; 10-31-2019 at 11:14 PM.
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  #2  
Old 10-31-2019, 11:20 PM
Chedley Chedley is offline
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Mein Auto: 2001 E39 540i
Use a regular socket wrench, with an extension.
No need for a spark plug wrench.
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Old 11-01-2019, 12:11 AM
Bmwe39528i Bmwe39528i is online now
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What Chedley said. I changed them on both of my 528i's. Used deep socket and then a magnet to get them out
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Old 11-01-2019, 02:45 AM
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Burning2nd Burning2nd is offline
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Mein Auto: e39, e83, e60
well a spark plug socket has a piece of rubber that holds the plug in the socket..

13/16's or 5/8's

mine are both very very deep (*like 6") with 3/8's drive
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Old 11-01-2019, 05:14 AM
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crazy4trains crazy4trains is offline
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Yeah, the rubber insert is nice. Keeps the plugs, especially the new plugs, from falling out of the socket.
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Old 11-01-2019, 06:51 AM
cn90 cn90 is online now
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The rubber insert has its own issues.
If the rubber inserts falls off and stays with the spark plug, it is a pain to remove.

I do NOT use rubber insert any longer.

I currently use Magnetic Gear Wrench:

https://www.bimmerfest.com/forums/sh...php?p=12972983
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Old 11-01-2019, 09:30 AM
528iAut 528iAut is offline
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You have one in your toolbox in the cars trunk, just dont use the little rod to wrench it with, it will bend...
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Old 11-01-2019, 10:37 AM
edjack edjack is offline
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Mein Auto: '97 540i 6 speed
12-point sockets have thinner walls.

And I use a locking extension to retain the socket.

Finally, I do not use a thread lube. BMW recommend dry installation; modern plugs have a electroplated body to ameliorate stuck plugs.
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Last edited by edjack; 11-01-2019 at 10:42 AM.
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Old 11-01-2019, 11:14 AM
namelessman namelessman is offline
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Rubber grommets in spark plug sockets can come loose and stick with the plugs, and can be a pain to remove from deep inside opening.

Metal prongs in spark plug sockets can scratch the ceramic insulation on the new plugs, and affect the operating characteristics of the plug.

A good magnetic socket is really the way to go, M54 needs 16mm(6 point?), the newer engine needs 14mm (really) thin wall 12 point, e.g. BMS has a great one.
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Old 11-04-2019, 07:55 AM
cn90 cn90 is online now
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1+,

As I mentioned above, once you go MAGNETIC wrench, there is no going back to rubber.
It is so much better with magnetic.
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  #11  
Old 11-04-2019, 11:14 AM
namelessman namelessman is offline
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Quote:
Originally Posted by cn90 View Post
1+,

As I mentioned above, once you go MAGNETIC wrench, there is no going back to rubber.
It is so much better with magnetic.
My local trusted indy said the same, a good quality magnetic socket delivers reliable service every time in first try, while rubber/prong sockets keep breaking, which costs time and money!
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